Nugget: String concatenation compiler optimisation

William Brander responded to my last nugget on compiler optimisation with a tweet about another one:

So what does that look like? Let’s look at the code we type:

string interesting = "first";
interesting += " second";
interesting += " third" + " forth";
interesting = interesting + " fifth";
interesting = interesting + " sixth" + " seventh";
Console.WriteLine(interesting);

And this optimises the concatenation to a single line and drops the variable. Interesting use of braces for fifth & sixth though, when I switched += to =.

Console.WriteLine(("first" + " second" + " third forth") + " fifth" + " sixth seventh");